When did the Ark of the Covenant go missing?
The Ark of the Covenant went missing at the Babylonian captivity and the invasion of Nebuchadnezzar. Nothing indicates the Babylonians took it with them, and Revelation 11:19 later reveals the Ark of the Covenant in God's heavenly temple during the Tribulation.
Les explains that the Ark of the Covenant has been gone ever since the Babylonian captivity and the invasion of Nebuchadnezzar, though there is nothing to indicate the Babylonians took it with them. When asked where the Ark is tonight, he turns to Revelation 11. There, during the Tribulation, the temple of God is opened in heaven, and the Ark of His Testament—or Covenant—is seen in heaven, accompanied by lightnings, voices, thunderings, an earthquake, and great hail. Les also notes that some claim to know where the Ark is, and that Israel will frantically look for it when they rebuild the temple, which is not too far in the future.